CN113482817B - Pump-nozzle fuel injection supply system - Google Patents
Pump-nozzle fuel injection supply system Download PDFInfo
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- CN113482817B CN113482817B CN202110942030.4A CN202110942030A CN113482817B CN 113482817 B CN113482817 B CN 113482817B CN 202110942030 A CN202110942030 A CN 202110942030A CN 113482817 B CN113482817 B CN 113482817B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
- F02M55/02—Conduits between injection pumps and injectors, e.g. conduits between pump and common-rail or conduits between common-rail and injectors
- F02M55/025—Common rails
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
- F02M37/22—Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines, e.g. arrangements in the feeding system
- F02M37/32—Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines, e.g. arrangements in the feeding system characterised by filters or filter arrangements
- F02M37/44—Filters structurally associated with pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
- F02M59/44—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
- F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
- F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
- F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M65/00—Testing fuel-injection apparatus, e.g. testing injection timing ; Cleaning of fuel-injection apparatus
- F02M65/003—Measuring variation of fuel pressure in high pressure line
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
The invention provides a pump-nozzle fuel injection supply system, relates to the technical field of diesel engines, and solves the technical problems that a high-pressure common rail injection system occupies a large space and cannot meet the requirement of compact structure of a high-speed diesel engine for propelling a ship. The system comprises a supply pump, a fuel filter, a pump type fuel injector and a manual pre-supply pump, wherein the suction side of the supply pump is communicated with a fuel tank through an oil inlet channel, the oil outlet side of the supply pump is communicated with the pump type fuel injector through an oil conveying channel, so that low-pressure fuel oil formed in the oil conveying channel is input to the pump type fuel injector, and the pump type fuel injector is used for pressurizing the fuel oil and then injecting the pressurized fuel oil; the manual pre-feeding pump is arranged on the oil inlet channel, the downstream end of the oil delivery channel flowing through the pump type oil sprayer is communicated with the suction side of the feeding pump through an overflow pipeline, and the overflow pipeline is provided with a release valve. The invention has smaller occupied volume, not only meets the compactness of the structure of a high-speed diesel engine, but also can effectively improve the space utilization rate of the diesel engine and realize high-pressure fuel injection.
Description
Technical Field
The invention relates to the technical field of diesel engines, in particular to a pump-nozzle fuel injection supply system.
Background
In the face of increasingly severe requirements of emission regulations and continuous strengthening of power density indexes of diesel engines, fuel injection systems of diesel engines experience a development process from a pressure accumulation type to a mechanical type to an electric control type, and novel electric control high-pressure fuel injection systems such as a high-pressure common rail system and the like are widely applied.
Due to the structural characteristics and good application prospects of the electronic control high-pressure common rail fuel injection technology, domestic diesel engine manufacturers mostly adopt a high-pressure common rail injection system as a technical development line, but for high-speed diesel engines for ship and boat propulsion, the diesel engines are required to have the characteristics of high strengthening degree, high power density, compact structure, convenience in maintenance and the like.
The existing high-pressure common rail injection system mainly filters diesel oil in an oil tank, then conveys high-pressure fuel oil to a common rail pipe through a high-pressure pump, the common rail pipe accumulates the high-pressure fuel oil output by an oil pump through a common rail cavity with a large volume, eliminates pressure fluctuation in the fuel oil, then conveys the high-pressure fuel oil to each oil injector, realizes the start and the stop of injection by controlling an electromagnetic valve on the oil injector, and supplies the high-pressure fuel oil to a corresponding oil cylinder.
A high-pressure common rail injection system is a way of supplying oil that completely separates the generation of injection pressure and the injection process from each other.
The applicant has found that the prior art has at least the following technical problems:
although having many advantages, high-pressure common rail injection systems still have many disadvantages, mainly including:
1. the high-pressure oil pump, the common rail pipe and the high-pressure oil pipe of the electric control high-pressure common rail system are externally arranged on the side surface of the diesel engine, so that a larger structural space is occupied, the volume of the diesel engine is increased, the hydraulic rigidity of a fuel system is reduced, and the requirement on the compactness of a high-speed diesel engine for propulsion is difficult to meet; and simultaneously, the high pressure in the fuel pipeline requires that the fuel pipeline has high hydraulic rigidity, so that the weight and the volume of the diesel engine are increased.
2. High-pressure fuel oil generated by the common rail pump needs to enter the oil injector through the oil inlet pipe, the common rail pipe and the high-pressure oil pipe, the number of connecting parts is large, the structural integrity is poor, the high-pressure pipeline is easy to generate fuel oil leakage under the high-power working condition, the rail pressure of the diesel engine is unstable, and the injection pressure is reduced or even the diesel engine is shut down.
3. The high-pressure common rail injection system is complex, the types of parts are more, the vibration and noise source quantity of the diesel engine is increased, and the mechanical mechanism limits the improvement of the power strengthening index of the diesel engine.
Disclosure of Invention
The invention aims to provide a pump-nozzle fuel injection supply system, which aims to solve the following technical problems in the prior art: the high-pressure common rail injection system cannot meet the requirement of compact structure of a high-speed diesel engine for propelling ships and boats due to the fact that the common rail pipe and the high-pressure pipeline are arranged to occupy large space; the technical effects that can be produced by the preferred technical scheme of the technical schemes provided by the invention are described in detail in the following.
In order to achieve the purpose, the invention provides the following technical scheme:
the invention provides a pump-nozzle fuel injection supply system, which comprises a supply pump, a fuel filter, a pump type fuel injector and a manual pre-supply pump, wherein:
the suction side of the supply pump is communicated with an oil tank through an oil inlet channel, the oil outlet side of the supply pump is communicated with the pump type oil sprayer through an oil conveying channel, so that low-pressure fuel oil formed in the oil conveying channel is input to the pump type oil sprayer, and the pump type oil sprayer is used for pressurizing and spraying the fuel oil;
the manual pre-feeding pump is arranged on the oil inlet channel, the oil delivery channel flows through the downstream end of the pump type oil sprayer and is communicated with the suction side of the feeding pump through an overflow pipeline, and the overflow pipeline is provided with a release valve.
Preferably, the number of the pump type oil injectors includes one or more than two, and all the pump type oil injectors are communicated with the oil delivery channel;
an overflow valve is arranged on the overflow pipeline.
Preferably, a ventilation valve is arranged at the other oil outlet of the fuel filter, and the oil outlet is communicated with the oil tank through a return pipeline.
Preferably, there is a pressurization line and a vent line within the supply pump, wherein:
the pressurizing pipeline is communicated with the suction side and the oil outlet side of the supply pump and is used for pressurizing the fuel;
the exhaust pipe directly communicates the suction side and the oil discharge side of the supply pump, and a first check valve is provided on the exhaust pipe, the first check valve allowing only air and/or fuel to flow from the suction side to the oil discharge side of the supply pump when the manual pre-supply pump is pressurized.
Preferably, a safety pipeline is further arranged in the supply pump, the safety pipeline is communicated with the suction side of the supply pump and an oil inlet of the fuel filter, a safety valve is arranged on the safety pipeline, and the safety valve only allows the fuel oil in the oil inlet of the fuel filter to flow to the suction side of the supply pump.
Preferably, a pressure sensor is arranged on the fuel filter and used for detecting the fuel pressure at the fuel outlet of the fuel filter.
Preferably, the pump-nozzle fuel injection supply system further comprises an electronic control unit, the electronic control unit is provided with a heat dissipation channel, wherein:
the heat dissipation cavity is in the last linear form or the bending form of coiling of electronic control unit, the oil feed passageway passes the heat dissipation cavity, the low temperature fuel of circulation is used for right in the oil feed passageway the electronic control unit heat dissipation.
Preferably, still be provided with the strainer on the oil feed passageway, the strainer is located manual confession pump in advance with between the oil tank.
Preferably, a second check valve is present in the manual priming pump, said second check valve allowing only fuel in the manual priming pump to flow to the feed pump.
Preferably, a third check valve is arranged on an oil outlet of the fuel filter, which is connected with the oil delivery channel, and the third check valve only allows the fuel in the fuel filter to flow to the pump-type fuel injector.
Compared with the prior art, the pump-nozzle fuel injection supply system provided by the invention has the following beneficial effects:
the manual pump is used for sucking fuel oil after the fuel oil system is emptied, and the air in the pipeline can be discharged by the air release valve, so that the supply pump is ensured to be started smoothly. The system principle is different from a high-pressure common rail injection system, the system enables fuel to have lower pressure in an oil delivery channel through a supply pump, the fuel is pressurized by a pump type oil sprayer and then injected into an oil cylinder when being delivered to the pump type oil sprayer, the high fuel injection pressure is provided by the pump type oil sprayer, compared with the high-pressure common rail injection system, the pressure of the fuel injected into the oil cylinder is the same, but low-pressure fuel circulates in a pipeline in the system, the design can be carried out by adopting a structural form of combining a soft pipe and a hard pipe, and the design redundancy and the assembly of the system pipeline are improved. The hydraulic rigidity of the fuel pipeline of the whole system is increased, and the frequency and the risk of leakage of the fuel pipeline are reduced. Because the fuel pressure in the pipeline is low, and the common rail pipe and the high-pressure oil pipe structure are omitted, the system occupies a smaller volume relatively, not only can the compactness of the high-speed diesel engine structure be met, but also the space utilization rate of the diesel engine can be effectively improved, and the high-pressure fuel injection can be realized.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of a pump-nozzle fuel injection supply system.
In the figure 1, a fuel tank; 2. a coarse filter; 3. a manual pre-feeding pump; 4. a second check valve 5, a heat dissipation cavity channel; 6. a supply pump; 61. a pressurization pipeline; 62. an exhaust line; 63. a safety line; 7; a first check valve, 8, a safety valve; 9. a fuel filter; 10. a fuel filter housing; 11. a vent valve; 12. a third check valve; 13. a pressure sensor; 14. an oil delivery passage; 15. a pump injector; 16. a deflation valve; 17. an overflow valve; 18. a return line; 19. an oil inlet channel; 20. and an overflow pipeline.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It should be apparent that the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "length", "width", "height", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "side", and the like, indicate orientations and positional relationships based on the orientations and positional relationships shown in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the equipment or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the high-pressure common rail injection system in the prior art, after diesel oil in an oil tank is filtered, high-pressure fuel oil is conveyed to a common rail pipe through a high-pressure pump, the common rail pipe accumulates the high-pressure fuel oil output by the oil pump through a common rail cavity with a large volume, pressure fluctuation in the fuel oil is eliminated, then the high-pressure fuel oil is conveyed to each oil injector, the start and the stop of injection are realized by controlling an electromagnetic valve on the oil injector, and the high-pressure fuel oil is supplied to a corresponding oil cylinder.
However, the high-pressure common rail injection system is filled with high-pressure fuel oil and includes a common rail pipe, and the high-pressure fuel oil and the common rail pipe occupy a large space and are not suitable for being applied to high-speed diesel engines for propelling ships and boats. And the fuel pressure in the pipeline is high, so that once the pipeline is blocked and the like, serious potential safety hazards exist, fuel leakage is easily generated under the high-power working condition, the rail pressure of the diesel engine is unstable, and the injection pressure is reduced or even the diesel engine is stopped. Therefore, it is a problem to solve the above problems without reducing the pressure of the fuel entering the cylinder.
In view of the above problems, embodiments of the present invention provide a pump-nozzle fuel injection supply system, which can not only meet the compactness of a high-speed diesel engine structure, but also effectively improve the space utilization rate of the diesel engine, and can also realize high-pressure fuel injection.
The technical solution provided by the present invention is explained in more detail below with reference to fig. 1.
As shown in fig. 1, the present embodiment provides a pump-nozzle fuel injection supply system including a supply pump 6, a fuel filter 9, a pump injector 15, and a manual pre-supply pump 3, wherein: the suction side of the supply pump 6 is communicated with the oil tank 1 through an oil inlet channel 19, the oil outlet side of the supply pump 6 is communicated with a pump type oil injector 15 through an oil delivery channel 14, so that low-pressure fuel oil formed in the oil delivery channel 14 is input into the pump type oil injector 15, and the pump type oil injector 15 is used for pressurizing the fuel oil and injecting the pressurized fuel oil; the manual pre-feeding pump 3 is arranged on the oil inlet channel 19, the downstream end of the oil delivery channel 14 flowing through the pump type oil injector 15 is communicated with the suction side of the feeding pump 6 through an overflow pipeline 20, and the overflow pipeline 20 is provided with a release valve 16.
The fuel filter 9 is used for fine filtering and oil-water separation of fuel, so that clean fuel enters the pump type fuel injector 15. The fuel filter 9 is well known in the art, and the structure thereof will not be described herein. The feed pump 6 is also well-known in the art, for example, a gear type oil pump can be used and driven by a diesel engine, and the fuel feed pump 6 supplies 3-6 bar of pressurized fuel to a fuel pipeline. The pump injector 15 may be a well-known technique in the art, and includes a pump body therein, and is capable of pressurizing low-pressure fuel flowing into the pump injector 15 in the fuel delivery passage 14 into high-pressure fuel, and then injecting the high-pressure fuel into the cylinder.
When the diesel engine for driving the feed pump 6 is not started for a long time, the feed pump 6 often has an excessive vapor lock in the pipe, and it is difficult for the feed pump to pump the fuel in the fuel tank 1. The manual pre-feeding pump 3 and the air release valve 16 are arranged in the system, the manual pre-feeding pump 3 is used for sucking fuel oil after the fuel oil system is emptied, and the air release valve 16 can discharge air in a pipeline to ensure that the feeding pump 6 is started smoothly.
When the diesel engine is not started for a long time or the fuel system is exhausted, the air release valve 16 is opened and the manual pre-supply pump 3 is continuously pressed, so that fuel is sucked from the fuel tank 1 to the fuel delivery pipeline, air in the fuel delivery pipeline is discharged from the fuel system through the air release valve 16 under the action of pressurized fuel, and the air release valve 16 is manually closed after the air release valve 16 discharges the fuel. The above structure can facilitate quick and safe start of the feed pump 6.
The principle of the pump-nozzle fuel injection supply system is different from that of a high-pressure common rail injection system, the system enables fuel to have lower pressure in an oil delivery channel 14 through a supply pump 6, the fuel is pressurized by a pump type oil injector 15 and then injected into an oil cylinder when being delivered to the pump type oil injector 15, the high fuel injection pressure is provided by the pump type oil injector 15, compared with the high-pressure common rail injection system, the pressure of the fuel injected into the oil cylinder is the same, but low-pressure fuel flows in a pipeline in the system.
The pump-nozzle fuel injection supply system has the following beneficial effects:
1. the structure of a common rail pipe and a high-pressure oil pipe is omitted, the number of parts is small, the size is small, the compactness of the high-speed diesel engine is met, the space utilization rate of the diesel engine can be effectively improved, high-pressure fuel injection and electric control injection can be realized, and the requirement of the compactness of the high-intensity high-power-density diesel engine is met.
2. The high fuel injection pressure (1500-2000 bar) is provided by the unit pump type fuel injector 15, the pipeline arrangement of the fuel system is simple and effective, the highest fuel pressure in the pipeline is 6bar, the hydraulic rigidity of the fuel pipeline of the whole system is increased, and the leakage frequency and risk of the fuel pipeline are reduced.
3. The lower fuel pressure in the fuel pipeline of the invention ensures that the fuel pipeline can be designed by adopting a structure form of combining a soft pipe and a hard pipe, thus improving the design redundancy and the assembly of the system pipeline. The volume and weight of the fuel supply pump 6 are greatly reduced due to the lower fuel pressure requirement in the fuel pipeline, and the compactness and lightweight design difficulty of the diesel engine are reduced.
As an alternative embodiment, the number of the pump injectors 15 includes one or more than two, as shown in fig. 1, in this embodiment, more than two single pump injectors 15 are included, and all the pump injectors 15 are communicated with the oil delivery passage 14; the pump injector 15 is set according to the number data of the cylinders, and is not limited herein.
An overflow valve 17 is present on the overflow line 20. The fuel oil flows into a longitudinal fuel oil channel in a cylinder cover through an oil pipeline after passing through a fuel oil filter 9, the longitudinal fuel oil channel is formed by connecting annular channels in the cylinder cover around each fuel oil injector, the fuel oil flows into a single pump type fuel oil injector 15 through the longitudinal fuel oil channel to realize the supply of the high-pressure injection fuel oil of the diesel engine, and the redundant fuel oil flows back to the suction side of a fuel oil supply pump 6 through an overflow valve 17 and an overflow pipeline 20 to form a fuel oil circulation loop; the purge valve 16 is used for fuel system venting.
As an alternative embodiment, referring to fig. 1, a vent valve 11 is provided at another outlet of the fuel filter 9, and the outlet is communicated with the fuel tank 1 through a return line 18.
The fuel filter 9 carries out fine filtration and oil-water separation on fuel, and when the diesel engine is started, air and a small amount of fuel in the fuel filter 9 flow back to the fuel tank 1 through the vent valve 11 and the return pipeline 18, so that circulation of the fuel is realized.
Referring to fig. 1, in the present embodiment, a pressurizing line 61 is provided in the feed pump 6, and the pressurizing line 61 communicates between the suction side and the discharge side of the feed pump 6 to pressurize the fuel and circulate the low-pressure fuel through the fuel delivery passage 14. The above-mentioned supply pump 6 is well-known in the art, and the structure thereof will not be described herein.
Referring to fig. 1, an exhaust pipe 62 is further provided in the supply pump 6 of the present embodiment, the exhaust pipe 62 directly connects the intake side and the discharge side of the supply pump 6, and the exhaust pipe 62 is provided with a first check valve 7, and the first check valve 7 allows only air and/or fuel to flow from the intake side to the discharge side of the supply pump 6 when the manual pre-supply pump 3 is pressurized.
When the diesel engine is not started for a long time, the supply pump 6 is not started firstly, the air release valve 16 is opened firstly, the manual pre-supply pump 3 is used, air in a pipeline enters an exhaust passage in the supply pump 6 under the action of pressurized fuel oil, because the supply pump 6 does not start to work, the fuel oil cannot enter a pressurized pipeline 61 in the supply pump 6, and the air enters the oil transportation passage 14 through the first check valve 7 under the action of the pressurized fuel oil and is discharged through the air release valve 16; when oil flows out of the air release valve 16, air in the pipeline is exhausted, the manual pre-feeding pump 3 is closed at the moment, and the feeding pump 6 is opened to start working normally.
It should be understood that when the diesel engine is started, the pressure of the fuel in the pipeline is low, and the pressure of the fuel can not open the first check valve 7 into the exhaust passage, that is, when the diesel engine is started, the fuel can only enter the pressurizing pipeline 61 to be pressurized and then flows out of the supply pump 6. When the diesel engine is not started, the manual pre-supply pump 3 is used to discharge air in the pipeline through the air release valve 16 under the action of pressurized fuel, the manual pre-supply pump 3 enables the pressure of the pressurized fuel to open the exhaust pipeline 62, and the fuel cannot be pressurized through the pressurizing pipeline 61 in the supply pump 6 at the same time because the supply pump 6 is not started.
Because the fuel filter 9 carries out fine filtration and oil-water separation to the fuel, when the fuel filter 9 blocks up, the pressure in the pipeline may rise, and the pipeline between the oil outlet of the supply pump 6 and the oil inlet of the fuel filter 9 is blocked, so that the fuel is difficult to convey.
In view of the above problem, referring to fig. 1, a safety pipeline 63 is further provided in the supply pump 6 of the present embodiment, the safety pipeline 63 communicates the suction side of the supply pump 6 with the oil inlet of the fuel filter 9, a safety valve 8 is provided on the safety pipeline 63, and the safety valve 8 only allows the fuel in the oil inlet of the fuel filter 9 to flow to the suction side of the supply pump 6.
When the fuel filter 9 is blocked, the pressure on one side of the oil outlet of the supply pump 6 rises, at the moment, fuel oil can enter the safety pipeline 63 through the safety valve 8 under the action of pressure difference and flows back to the suction side of the supply pump 6 through the safety pipeline 63, and therefore the situation that the pipeline pressure rises due to the blockage of the fuel filter 9 and potential safety hazards are caused is prevented.
As an optional implementation manner, the fuel filter 9 of the present embodiment is provided with a pressure sensor 13 for detecting the fuel pressure at the fuel outlet of the fuel filter 9. The pressure sensor 13 can be fixed on the fuel filter shell 10 to detect the fuel pressure at the fuel outlet of the fuel filter 9 in real time, so as to control the pressure in the fuel delivery channel 14.
As an alternative embodiment, the pump-nozzle fuel injection supply system further includes an Electronic Control Unit (ECU) electrically connectable with the pressure sensor 13 and the supply pump 6, and configured to compare the actual pressure level received from the pressure sensor 13 with the set pressure to control the operation state of the supply pump 6.
There is corresponding circuit on the electronic control element, and the during operation easily produces the heat, in order to dispel the heat to the electronic control unit in this system, see as shown in fig. 1, be provided with heat dissipation chamber way 5 on the electronic control unit, wherein: the heat dissipation cavity channel 5 is coiled on the electronic control unit in a linear or bent shape, the oil inlet channel 19 penetrates through the heat dissipation cavity channel 5, and low-temperature fuel oil circulating in the oil inlet channel 19 is used for dissipating heat of the electronic control unit.
According to the structure, the oil inlet channel 19 penetrates through the heat dissipation cavity channel 5, the cold energy is transferred to the electronic control element by the low-temperature fuel oil in the oil inlet channel 19, the heat of the electronic control unit is taken away when the low-temperature fuel oil leaves the heat dissipation cavity channel 5, the electronic control unit can be effectively cooled, redundant refrigerant pipelines are not needed, and the structure is simple and compact.
As an alternative embodiment, referring to fig. 1, a coarse filter 2 is further disposed on the oil inlet passage 19, and the coarse filter 2 is located between the manual pre-supply pump 3 and the oil tank 1. The feed pump 6 pumps the fuel from the fuel tank 1 into the oil inlet line, in which the fuel first flows to the strainer 2, and the strainer 2 performs rough filtration and oil-water separation of the fuel.
As an alternative embodiment, referring to fig. 1, a second check valve 4 is present in the manual pre-feed pump 3, and the second check valve 4 only allows the fuel in the manual pre-feed pump 3 to flow to the supply pump 6, so as to prevent the fuel from flowing back to the fuel tank 1 and ensure the fuel to flow to the electronic control unit and the supply pump 6 smoothly.
As an alternative embodiment, see fig. 1, a third check valve 12 is arranged at the outlet of the fuel filter 9 connected to the fuel supply channel 14, the third check valve 12 allowing only fuel in the fuel filter 9 to flow to the pump injector 15. The third check valve 12 is used to prevent fuel leakage when replacing the filter element of the fuel filter 9 and is used as an overflow valve 17 for the high-level fuel tank 1.
Referring to fig. 1, the operation of the pump-nozzle fuel injection supply system of the present embodiment is as follows:
the method comprises the following steps: when the diesel engine is not started for a long time or the fuel system is exhausted, the air release valve 16 is opened and the manual pre-supply pump 3 is continuously pressed, so that fuel is sucked from the fuel tank 1 to the fuel inlet pipeline, air in the fuel inlet pipeline is discharged from the fuel system through the air vent valve and the air release valve 16 under the action of pressurized fuel, and the air release valve 16 and the manual pre-supply pump 3 are manually closed after the air release valve 16 discharges the fuel.
Step two: the diesel engine is started, the supply pump 6 starts to work under the driving of the diesel engine, fuel enters the oil inlet pipeline under the suction action of the supply pump 6, the fuel passes through the check valve of the manual pre-supply pump 3 after being subjected to rough filtration and oil-water separation of the rough filter 2 and flows to the electronic control unit, the fuel flowing back from the overflow valve 17 is mixed with the fuel from the oil tank 1 and flows into the supply pump 6, and the fuel is pressurized to 3-6 bar through the pressurizing pipeline 61 under the action of the supply pump 6 and then flows into the fuel filter 9 from the oil outlet of the supply pump 6.
When the line pressure becomes high after the supply pump 6 due to clogging of the fuel filter 9 or the like, the fuel is returned to the suction side of the supply pump 6 through the authorized line by the relief valve 8. The fuel filter 9 performs fine filtration and oil-water separation on the fuel, and when the diesel engine is started, air and a small amount of fuel in the fuel pipeline flow back to the fuel tank 1 through the vent valve 11 and the return pipeline 18. The fuel oil filtered by the fuel oil filter 9 enters a longitudinal fuel oil channel in a cylinder cover through the fuel oil conveying channel 14 and flows into the single pump type fuel oil injector 15, the supply of the high-pressure injection fuel oil of the diesel engine is realized through the pressurization of the pump type fuel oil injector 15, and the redundant fuel oil flows back to the suction side of the fuel oil supply pump 6 through the overflow valve 17.
The particular features, structures, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.
In the description of the specification, reference to the description of "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Moreover, various embodiments or examples and features of various embodiments or examples described in this specification can be combined and combined by one skilled in the art without being mutually inconsistent.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (9)
1. A pump-nozzle fuel injection supply system, comprising a supply pump (6), a fuel filter (9), a pump injector (15) and a manual pre-supply pump (3), wherein:
the suction side of the supply pump (6) is communicated with an oil tank (1) through an oil inlet channel (19), the oil outlet side of the supply pump (6) is communicated with the pump type oil injector (15) through an oil delivery channel (14), so that low-pressure fuel oil formed in the oil delivery channel (14) is input to the pump type oil injector (15), and the pump type oil injector (15) is used for pressurizing and injecting the fuel oil;
the manual pre-feeding pump (3) is arranged on an oil inlet channel (19), the downstream end of the oil conveying channel (14) flowing through the pump type oil sprayer (15) is communicated with the suction side of the supply pump (6) through an overflow pipeline (20), and a release valve (16) is arranged on the overflow pipeline (20);
a pressurization line (61) and an exhaust line (62) are present inside the feed pump (6), wherein:
the pressurizing pipeline (61) is communicated with the suction side and the oil outlet side of the supply pump (6) and is used for pressurizing fuel;
the exhaust pipeline (62) is directly communicated with the suction side and the oil outlet side of the supply pump (6), and a first check valve (7) is arranged on the exhaust pipeline (62), and the first check valve (7) only allows air and/or fuel to flow from the suction side to the oil outlet side of the supply pump (6) when the manual pre-supply pump (3) is pressurized.
2. The pump-nozzle fuel injection supply system according to claim 1, characterized in that the number of the pump injectors (15) includes one or more than two, and all of the pump injectors (15) are communicated with the delivery passage (14);
an overflow valve (17) is arranged on the overflow pipeline (20).
3. Pump-nozzle fuel injection supply system according to claim 1, characterized in that a further outlet of the fuel filter (9) is provided with a ventilation valve (11) and communicates with the fuel tank (1) via a return line (18).
4. A pump-nozzle fuel injection supply system according to any one of claims 1-3, characterized in that a safety line (63) is also present in the supply pump (6), the safety line (63) communicating the suction side of the supply pump (6) with the oil inlet of the fuel filter (9), a safety valve (8) being present in the safety line (63), the safety valve (8) allowing only fuel in the oil inlet of the fuel filter (9) to flow to the suction side of the supply pump (6).
5. A pump-nozzle fuel injection supply system according to any one of claims 1-3, characterized in that a pressure sensor (13) is provided on the fuel filter (9) for detecting the fuel pressure at the outlet of the fuel filter (9).
6. A pump-nozzle fuel injection supply system according to any one of claims 1-3, characterized by further comprising an electronic control unit provided with a heat dissipation channel (5), wherein:
the heat dissipation cavity channel (5) is in the electronic control unit is provided with a linear or bent coil, the oil inlet channel (19) penetrates through the heat dissipation cavity channel (5), and low-temperature fuel oil circulating in the oil inlet channel (19) is used for dissipating heat of the electronic control unit.
7. A pump-nozzle fuel injection supply system according to any one of claims 1 to 3, characterized in that a strainer (2) is further provided on the oil inlet passage (19), the strainer (2) being located between the manual pre-supply pump (3) and the oil tank (1).
8. A pump-nozzle fuel injection supply system according to any one of claims 1-3, characterized in that a second check valve (4) is present in the manual priming pump (3), said second check valve (4) allowing only the fuel in the manual priming pump (3) to flow to the supply pump (6).
9. A pump-nozzle fuel injection supply system according to any one of claims 1-3, characterized in that a third check valve (12) is provided at the outlet of the fuel filter (9) in connection with the fuel delivery passage (14), said third check valve (12) allowing only fuel in the fuel filter (9) to flow to the pump injector (15).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110942030.4A CN113482817B (en) | 2021-08-17 | 2021-08-17 | Pump-nozzle fuel injection supply system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110942030.4A CN113482817B (en) | 2021-08-17 | 2021-08-17 | Pump-nozzle fuel injection supply system |
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| Publication Number | Publication Date |
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| CN113482817A CN113482817A (en) | 2021-10-08 |
| CN113482817B true CN113482817B (en) | 2022-08-19 |
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Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2803049A1 (en) * | 1978-01-25 | 1979-08-09 | Bosch Gmbh Robert | PUMP NOZZLE FOR COMBUSTION MACHINES |
| CN103590943B (en) * | 2013-11-29 | 2015-10-14 | 中国第一汽车股份有限公司 | A kind of derv fuel supply system |
| CN205823507U (en) * | 2016-07-04 | 2016-12-21 | 内蒙古自治区民航机场集团有限责任公司呼和浩特分公司 | A kind of Novel diesel engine fuel oil supply system |
| CN108457781A (en) * | 2018-01-11 | 2018-08-28 | 东风商用车有限公司 | A kind of large diesel engine fuel system |
| CN113074068A (en) * | 2021-04-02 | 2021-07-06 | 浙江吉利控股集团有限公司 | Fuel supply system for vehicle, control method of fuel supply system and vehicle |
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2021
- 2021-08-17 CN CN202110942030.4A patent/CN113482817B/en active Active
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| CN113482817A (en) | 2021-10-08 |
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